[swift-evolution] Removing var keyword in protocol property reqirements

[Matthew Johnson]

> On Jan 18, 2017, at 10:54 AM, Joe Groff via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Jan 18, 2017, at 8:50 AM, Tony Allevato <tony.allevato at gmail.com> wrote:
>> 
>> Good point—I hadn't considered the distinction.
>> 
>> Does that mean a future version of Swift might allow `let` in a protocol to indicate a value that must be immutable after initialization, such that a computed `var { get }` wouldn't satisfy it?
> 
> It's conceivable that even computed `let` properties could be supported, if the getter implementation is a pure function of `self`.

How would that work when `self` is mutable?

> 
> -Joe
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